docs: async def rcpt(
          self,
          recipient: str,
          options: Iterable[str] = None,
          timeout: DefaultNumType = _default,
      ) -> SMTPResponse:
          """
          Send an SMTP RCPT command, which specifies a single recipient for
          the message. This command is sent once per recipient and must be
          preceded by 'MAIL'.
  
          :raises SMTPRecipientRefused: on unexpected server response code
          """
          await self._ehlo_or_helo_if_needed()
  
          if options is None:
              options = []
  
          options_bytes = [option.encode("ascii") for option in options]
          to = b"TO:" + quote_address(recipient).encode("ascii")
  
          async with self._command_lock:
              response = await self.execute_command(
                  b"RCPT", to, *options_bytes, timeout=timeout
              )
  
          success_codes = (SMTPStatus.completed, SMTPStatus.will_forward)
          if response.code not in success_codes:
              raise SMTPRecipientRefused(response.code, response.message, recipient)
  
          return response